Shroud member for blades.



PATENTED 1130. 11, 1906.

M. ROTTER SHROUD MEMBER FQR BLADES. APPLICATION IILED 0UT.10. 190s.

INVENTOR I ATTORNEY.

\yW nNEssm-a Uni-re s'ra rns ATENT FFTCE.

MAX ROTTER, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-CHAL- MERSCOMPANY, OF MILWAUKEE, l/VISOONSIN, A CORPORATION OF NEWV JERSEY.

SHROUD MEMBER FOR BLADES.

Specification of Letters Patent.

Patented Dec. 11, 1906.

Application filed October 10,1906. Serial No. 338,222.

To all whom it may concern:

Be it known that 1, MAX Ror'rnn, a citizen of the United States,residing at Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented a certain new and useful Shroud Member forBlades, of which the following is a specification.

This invention relates to fluid-actuated or fluid-forcing mechanism, andspecifically to a structure of shroud member for blades which preventsthe operating fluid or the fluid operated upon from flowing by the endsof said blades when said blades are contained within a conduit orcasing.

On the drawings which accompany and form a part of this specification,and on which the same reference characters are used to indicate the sameelements wherever they appear in each of the several views, Figure 1represents in perspective a series of blades of a steam-turbine, as anexample, with this specific shroud member secured thereto, the bladesbeing disposed within a casing, a fragment of which is shown. Fig. 2represents in elevation a portion of a blade with the shroud memberattached thereto and the easing in section. Fig. 3 represents thepreferred construction of the shroud member.

On the drawings the reference character 1 represents a shaft upon whichis mounted a blade-carrying member 2, to which are secured the blades 3,each of the blades, as shown, being provided with a projection 4 on itsouter end, which is adapted to pass through a slot in the shroud member5 and be riveted thereon.

Reference character 6 represents a casing or conduit within which theshaft, blades, and shroud member are situated.

The fluid is assumed to flow in the direction indicated by the arrows,and so far as this specific construction is concerned it is immaterialwhether the blades are to be acted upon by any form of gaseous fluid,such as steam, or by a liquid, such as water.

This invention is specially adapted to be used in connection withsteam-turbines, and when used in connection with a turbine of any formwhatever to which it is applicable it is immaterial whether the shroudmember be attached to movable blades or to the easing adjacent to saidmovable blades or to the usual series of fixed or guide blades, such asare used in the Parsons type of steam-turbine.

The shroud member 5 is approximately U- shaped in cross-section, withthe concavity facing the flowing fluid. In the specific structure asshown by the drawings it is preferred to form this shroud member 5 asseen in cross-section, with a flat portion 7, which is adapted to besecured to the ends of the blades, a substantially semicircular portion8, the diameter of the circle-of which this is a part being less thanthe distance between the end of the blade and the casing, and thissemicircular portion terminated by the substantially radially extendedportion 9,which almost contacts with the casing.

In Fig. 3 is shown a shroud member similar to the one already described,except that the complete shroud member as a whole is composed of aplurality of separate sections, each of which is in cross-section aduplicate of the others, this construction permitting relativedisplacement as between different parts of the shroud.

The operation of the device is as follows: An operating fluid, forexample, flowing in the direction indicated by the arrow on Fig. 1 ofthe drawings and passing between the blades turns the blades,blade-carrying member, shroud, and shaft 1 within the casing 6. Thefluid entering the U-shaped portion of the shroud member will force thepart 9 of said shroud member outwardly toward the casing, as clearlyshown by Fig. 2 of the drawings, thereby diminishing the space betweensaid shroud member and the casing, thus preventing the fluid fromflowing by the wheel of blades between it and the casingv The shroudmember 5 is composed of a materialas brass, for example-which possessesthe requisite strength and resiliency.

It is immaterial whether the flat portion 7 of the shroud member beattached to the blades or to the casing. It is preferred, how ever, toattach it to the blades, for the reason that it simplifies theconstruction and can be used for spacing and uniting the free ends ofthe blades.

hat I claim is 1. The combination in a fluid apparatus with the bladesand an adjacent member of a resilient shroud member concave incrosssection located between said blades and said ICC adjacent memberwith the concave portion open in the direction in which the pressure ofthe fluid in the apparatus is the greater.

2 The combination in a fluid apparatus with the blades and an adjacentmember of a resilient shroud member concave in crosssection locatedbetween said blades and said adjacent member with the concave portionopen in the direction in which the pressure of the fluid in theapparatus is the greater, said shroud member being secured to the endsof the blades.

3. The combination in a fluid apparatus with the blades and an adjacentmember of a resilient shroud member concave in crosssection locatedbetween said blades and said adjacent member with the concave portionopen in the direction in which the pressure of the fluid in theapparatus is the greater, said shroud memberbeingsecured to the ends ofthe blades and provided with a radially-extended portion.

4. The combination in a fluid apparatus with the blades and an adjacentmember of a resilient shroud member concave in crosssection locatedbetween said blades and said adjacent member with the concave portion.

open in the direction in which the pressure of the fluid in theapparatus is the greater, said shroud member being secured to the endsof the blades and provided with a radially-extended portion, said shroudmember being composed of a plurality of separate sections.

In testimony whereof I affix my signature in the presence of twowitnesses.

MAX ROTTER.

